/* ============================================================
   SUBDIVISION SURFACES
   Light shell, navy structure, red for the detail that matters.
   The palette still encodes the algorithm:
     red  = the cage you author      (L0)
     navy = the surface it computes  (L∞)
   ============================================================ */

:root{
  /* surface */
  --bg:#FFFFFF;
  --bg-alt:#F1F4FA;
  --panel:#FFFFFF;
  --panel-2:#E9EFF7;
  --line:#DCE4EF;
  --line-2:#BCCADC;

  /* the two poles */
  --cage:#D01A2D;
  --cage-soft:rgba(208,26,45,.07);
  --cage-line:rgba(208,26,45,.34);
  --limit:#12386E;
  --limit-soft:rgba(18,56,110,.06);
  --limit-line:rgba(18,56,110,.26);

  /* deep field — cta and footer share it, separated by a hairline */
  --deep:#0E2647;
  --on-deep:#EEF3FA;
  --on-deep-mute:#9BAECA;

  /* text */
  --text:#0B111C;
  --muted:#4B5A72;
  --dim:#7B889D;

  /* type */
  --f-display:"Commissioner","Noto Sans Display","Segoe UI",system-ui,sans-serif;
  --f-body:"Literata","Noto Serif",Georgia,"Times New Roman",serif;
  --f-mono:"IBM Plex Mono",ui-monospace,Consolas,"Courier New",monospace;

  /* rhythm */
  --gap:clamp(18px,2.4vw,32px);
  --sec-pad:clamp(66px,8vw,120px);
  --radius:3px;

  --shadow-sm:0 1px 2px rgba(11,17,28,.05),0 10px 26px -20px rgba(11,17,28,.40);
  --shadow-md:0 28px 64px -44px rgba(11,17,28,.55);
}

*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none !important}

html[data-lang="el"] [data-l="en"]{display:none !important}
html[data-lang="en"] [data-l="el"]{display:none !important}

html{
  scroll-behavior:smooth;
  scroll-padding-top:86px;
  -webkit-text-size-adjust:100%;
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;transition-duration:.001ms !important}
}

body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--f-body);
  font-size:clamp(15.5px,.42vw + 14.6px,17px);
  line-height:1.68;
  font-optical-sizing:auto;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

/* ambient: one quiet wash + one hairline grid, nothing more */
body::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background:
    radial-gradient(120% 70% at 80% -10%, rgba(18,56,110,.07), transparent 62%),
    radial-gradient(90% 60% at 6% 2%, rgba(208,26,45,.045), transparent 58%);
}
body::after{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:0;opacity:.7;
  background-image:
    linear-gradient(to right,rgba(18,56,110,.045) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(18,56,110,.045) 1px,transparent 1px);
  background-size:96px 96px;
  -webkit-mask-image:radial-gradient(120% 90% at 50% 0%,#000 0%,transparent 78%);
  mask-image:radial-gradient(120% 90% at 50% 0%,#000 0%,transparent 78%);
}
main,.nav,.foot,.cta{position:relative;z-index:1}

img,svg,canvas{max-width:100%;display:block}

a{color:inherit}
:focus-visible{outline:2px solid var(--cage);outline-offset:3px;border-radius:2px}

.visually-hidden{
  position:absolute;width:1px;height:1px;margin:-1px;padding:0;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
.skip{
  position:absolute;left:-9999px;top:0;z-index:99;
  background:var(--cage);color:#fff;padding:12px 18px;font-family:var(--f-mono);font-size:13px;
}
.skip:focus{left:12px;top:12px}

/* Grid and flex children default to min-width:auto, so one wide child
   (a code block, a long token) can push a whole track past the viewport.
   Every layout container on this page opts out. */
.cards-3>*,.split>*,.versus>*,.uses>*,.stackgrid>*,.creasegrid>*,
.dias-4>*,.srcgrid>*,.loopdiag>*,.stats>*,.rule>*,.tl__item>*,
.featlist>li>*,.layers>li>*,.foot__inner>*,.pager>*,
.doclayout>*,.topics>*{min-width:0}

/* ---------- shell ---------- */
.shell{
  width:100%;max-width:1260px;margin-inline:auto;
  padding-inline:clamp(20px,4.6vw,60px);
}
.shell--narrow{max-width:880px}

/* ---------- type roles ---------- */
.h-display{
  font-family:var(--f-display);
  font-weight:760;
  font-size:clamp(2.5rem,6.4vw,5.05rem);
  line-height:.98;
  letter-spacing:-.035em;
  margin:0 0 26px;
  text-wrap:balance;
  color:var(--limit);
}
.h-display em{font-style:normal;color:var(--cage)}
.h2{
  font-family:var(--f-display);
  font-weight:700;
  font-size:clamp(1.72rem,3.1vw,2.72rem);
  line-height:1.09;
  letter-spacing:-.028em;
  margin:0 0 18px;
  text-wrap:balance;
  color:var(--limit);
}
.h3{
  font-family:var(--f-display);
  font-weight:640;
  font-size:1.06rem;
  line-height:1.28;
  letter-spacing:-.012em;
  margin:0 0 10px;
  color:var(--text);
}
.mono-label{
  font-family:var(--f-mono);
  font-size:.665rem;
  font-weight:500;
  letter-spacing:.17em;
  text-transform:uppercase;
  color:var(--dim);
}
.lede{
  font-size:clamp(1.02rem,1.15vw,1.16rem);
  color:var(--muted);
  max-width:56ch;
  margin:0 0 34px;
}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
code{
  font-family:var(--f-mono);font-size:.86em;
  background:var(--panel-2);border:1px solid var(--line);
  padding:.08em .38em;border-radius:2px;color:var(--limit);
}

/* ============================================================
   NAV
   ============================================================ */
.progress{position:fixed;top:0;left:0;right:0;height:2px;z-index:60;background:transparent}
.progress i{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--limit),var(--cage));
}

.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.80);
  backdrop-filter:blur(14px) saturate(1.25);
  -webkit-backdrop-filter:blur(14px) saturate(1.25);
  border-bottom:1px solid transparent;
  transition:border-color .3s,background .3s,box-shadow .3s;
}
.nav.is-stuck{
  border-bottom-color:var(--line);
  background:rgba(255,255,255,.95);
  box-shadow:0 10px 30px -26px rgba(11,17,28,.7);
}
.nav__inner{display:flex;align-items:center;gap:20px;height:66px}

.brand{display:flex;align-items:center;gap:11px;text-decoration:none;flex:0 0 auto}
.brand__mark{width:34px;height:24px;flex:0 0 auto}
.brand__text{
  font-family:var(--f-display);font-weight:720;font-size:.94rem;letter-spacing:-.02em;
  color:var(--limit);
}
.brand__thin{font-weight:280;color:var(--muted);margin-left:.32em}

/* stretched to the full nav height so the dropdown opens flush against the
   bar — no dead gap for the pointer to fall through on the way down */
.nav__links{display:flex;gap:clamp(10px,1.5vw,22px);margin-left:auto;align-self:stretch;align-items:center}
.nav__links a{
  font-family:var(--f-mono);font-size:.72rem;letter-spacing:.075em;text-transform:uppercase;
  color:var(--muted);text-decoration:none;padding:7px 0;position:relative;white-space:nowrap;
  transition:color .2s;
}
.nav__links a::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--cage);transform:scaleX(0);transform-origin:left;transition:transform .28s;
}
.nav__links a:hover{color:var(--limit)}
.nav__links a:hover::after{transform:scaleX(1);opacity:.4}
.nav__links a.is-active{color:var(--cage);font-weight:600}
.nav__links a.is-active::after{transform:scaleX(1);opacity:1}

/* ---------- nav dropdown (Παραδοτέα → Π1 / Π2) ----------
   Opens on hover, on keyboard focus, and on click of the caret — the last
   one is what makes it usable on a touch device at desktop width. */
.nav__group{position:relative;display:flex;align-items:center;gap:4px;align-self:stretch}
.nav__caret{
  -webkit-appearance:none;appearance:none;background:transparent;border:0;padding:6px 0;cursor:pointer;
  display:inline-flex;align-items:center;color:var(--muted);transition:color .2s;
}
.nav__caret svg{width:9px;height:6px;display:block;transition:transform .25s}
.nav__caret:hover{color:var(--limit)}
.nav__group:hover .nav__caret svg,
.nav__group:focus-within .nav__caret svg,
.nav__group.is-open .nav__caret svg{transform:rotate(180deg)}

.nav__sub{
  position:absolute;top:100%;left:-14px;z-index:5;
  min-width:238px;margin:0;padding:6px;list-style:none;
  background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:0 24px 50px -30px rgba(11,17,28,.6);
  opacity:0;visibility:hidden;transform:translateY(-6px);
  transition:opacity .2s,transform .2s,visibility .2s;
}
.nav__group:hover .nav__sub,
.nav__group:focus-within .nav__sub,
.nav__group.is-open .nav__sub{opacity:1;visibility:visible;transform:none}

.nav__sub a{
  display:flex;align-items:baseline;gap:10px;padding:11px 12px;border-radius:2px;
  font-family:var(--f-body);font-size:.92rem;letter-spacing:0;text-transform:none;
  color:var(--text);white-space:nowrap;
}
.nav__sub a::after{display:none}
.nav__sub a:hover{background:var(--panel-2);color:var(--limit)}
.nav__sub a.is-active{background:var(--limit);color:#fff;font-weight:600}
.nav__sub-no{font-family:var(--f-mono);font-size:.66rem;letter-spacing:.1em;color:var(--cage)}
.nav__sub a.is-active .nav__sub-no{color:#FF8A96}

.nav__tools{display:flex;align-items:center;gap:12px;margin-left:8px}
.langswitch{display:flex;border:1px solid var(--line-2);border-radius:2px;overflow:hidden}
.langswitch button{
  -webkit-appearance:none;appearance:none;background:transparent;border:0;cursor:pointer;
  font-family:var(--f-mono);font-size:.68rem;letter-spacing:.1em;color:var(--dim);
  padding:6px 9px;transition:color .2s,background .2s;
}
.langswitch button:hover{color:var(--limit)}
.langswitch button.is-on{background:var(--limit);color:#fff}

.burger{display:none;-webkit-appearance:none;appearance:none;background:transparent;border:1px solid var(--line-2);border-radius:2px;width:36px;height:32px;cursor:pointer;padding:0;flex-direction:column;align-items:center;justify-content:center;gap:5px}
.burger span{display:block;width:16px;height:1.5px;background:var(--limit);transition:transform .25s,opacity .25s}
.burger[aria-expanded="true"] span:first-child{transform:translateY(3.25px) rotate(45deg)}
.burger[aria-expanded="true"] span:last-child{transform:translateY(-3.25px) rotate(-45deg)}

/* ============================================================
   PAGER — each nav entry is its own .html file, so prev/next
   replaces the continuous scroll of a one-page site
   ============================================================ */
.pagerwrap{border-top:1px solid var(--line);background:var(--bg)}
.pager{display:grid;grid-template-columns:1fr 1fr;background:var(--bg)}
.pager__side{
  background:var(--bg);text-decoration:none;
  padding:clamp(22px,3vw,34px) clamp(18px,2.4vw,30px);
  display:flex;flex-direction:column;gap:7px;
  transition:background .25s,color .25s;
}
.pager__side:hover{background:var(--panel-2)}
/* the divider only exists when there is something on both sides */
.pager__side--next{text-align:right;align-items:flex-end;grid-column:2;border-left:1px solid var(--line)}
.pager__side--next:only-child{border-left:0}
.pager__dir{
  font-family:var(--f-mono);font-size:.6rem;letter-spacing:.17em;text-transform:uppercase;
  color:var(--cage);
}
.pager__name{
  font-family:var(--f-display);font-weight:680;font-size:1.12rem;letter-spacing:-.018em;
  color:var(--limit);
}

/* ============================================================
   HERO
   ============================================================ */
.hero{padding:clamp(46px,7vw,90px) 0 0;overflow:hidden}
.hero__grid{
  display:grid;grid-template-columns:1.02fr .98fr;
  gap:clamp(28px,4vw,64px);align-items:center;
  padding-bottom:clamp(46px,6vw,78px);
}
.eyebrow{
  font-family:var(--f-mono);font-size:.7rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--cage);margin:0 0 24px;display:flex;flex-wrap:wrap;gap:.5em;align-items:center;
}
.eyebrow__sep{color:var(--line-2)}
.eyebrow span[data-l]{color:var(--muted)}

.hero__cta{display:flex;flex-wrap:wrap;gap:12px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  font-family:var(--f-mono);font-size:.74rem;letter-spacing:.11em;text-transform:uppercase;
  text-decoration:none;padding:14px 24px;border-radius:2px;border:1px solid transparent;
  transition:transform .18s,background .22s,border-color .22s,color .22s,box-shadow .22s;
}
.btn--solid{background:var(--limit);color:#fff;font-weight:600}
.btn--solid:hover{background:var(--cage);transform:translateY(-2px);box-shadow:var(--shadow-sm)}
.btn--ghost{border-color:var(--line-2);color:var(--limit)}
.btn--ghost:hover{border-color:var(--cage);color:var(--cage);transform:translateY(-2px)}
.btn--lg{padding:18px 34px;font-size:.78rem}

/* ---------- SIGNATURE: the refiner ---------- */
.refiner{
  margin:0;background:var(--panel);
  border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow-md);
  overflow:hidden;
}
.refiner__head{
  display:flex;justify-content:space-between;align-items:center;gap:12px;
  padding:13px 16px;border-bottom:1px solid var(--line);flex-wrap:wrap;
  background:var(--bg-alt);
}
.refiner__head .mono-label{color:var(--limit)}
.refiner__scheme{color:var(--dim) !important;text-transform:none;letter-spacing:.08em}
.refiner__stage{position:relative;padding:8px}
#refinerCanvas{width:100%;height:auto;aspect-ratio:1/.78;display:block;touch-action:none;cursor:grab}
#refinerCanvas.is-grabbing{cursor:grabbing}
.refiner__hint{
  position:absolute;right:16px;bottom:12px;margin:0;pointer-events:none;
  opacity:.75;font-size:.6rem;
}
.refiner__ui{
  display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;
  padding:12px 16px;border-top:1px solid var(--line);
}
.levels{display:flex;gap:4px;flex-wrap:wrap}
.levels button{
  -webkit-appearance:none;appearance:none;cursor:pointer;background:var(--bg);border:1px solid var(--line-2);
  color:var(--muted);font-family:var(--f-mono);font-size:.67rem;letter-spacing:.07em;
  padding:6px 10px;border-radius:2px;transition:all .2s;
}
.levels button:hover{color:var(--limit);border-color:var(--limit-line)}
.levels button.is-on{background:var(--limit);border-color:var(--limit);color:#fff}
.readout{display:flex;gap:18px;margin:0}
.readout div{display:flex;flex-direction:column;gap:2px}
.readout dt{font-family:var(--f-mono);font-size:.575rem;letter-spacing:.15em;text-transform:uppercase;color:var(--dim)}
.readout dd{margin:0;font-family:var(--f-mono);font-size:.78rem;color:var(--limit)}
.refiner__legend{
  display:flex;gap:18px;flex-wrap:wrap;margin:0;padding:11px 16px;border-top:1px solid var(--line);
  background:var(--bg-alt);
}
.key{
  font-family:var(--f-mono);font-size:.605rem;letter-spacing:.13em;text-transform:uppercase;
  color:var(--dim);display:inline-flex;align-items:center;gap:8px;
}
.key::before{content:"";width:14px;height:0;border-top:1.6px solid currentColor}
.key--cage{color:var(--cage)}
.key--limit{color:var(--limit)}

/* ---------- ticker ---------- */
.ticker{
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  overflow:hidden;padding:11px 0;background:var(--bg-alt);
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent);
}
.ticker__track{
  display:flex;align-items:center;gap:0;width:max-content;
  animation:slide 48s linear infinite;
}
.ticker__track span{
  font-family:var(--f-mono);font-size:.665rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--muted);white-space:nowrap;
}
.ticker__track i{display:block;width:9px;height:9px;margin:0 26px;border:1px solid var(--cage-line);transform:rotate(45deg);flex:0 0 auto}
@keyframes slide{from{transform:translateX(0)}to{transform:translateX(-50%)}}
@media (prefers-reduced-motion:reduce){.ticker__track{animation:none}}

/* ============================================================
   SECTIONS
   ============================================================ */
.section{padding-block:var(--sec-pad)}
.section--alt{background:var(--bg-alt);border-block:1px solid var(--line)}

.shead{max-width:76ch;margin-bottom:clamp(34px,4.4vw,60px)}
.shead__tag{display:flex;gap:.9em;align-items:baseline;margin:0 0 16px;color:var(--cage)}
.shead__tag span[data-l]{color:var(--dim)}
.shead__lede{color:var(--muted);font-size:1.03rem;max-width:64ch;margin:0}
.shead__lede strong{color:var(--text);font-weight:600}

/* reveal */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .7s cubic-bezier(.2,.7,.3,1),transform .7s cubic-bezier(.2,.7,.3,1)}
.reveal.is-in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none}}

/* ---------- cards ---------- */
.cards-3{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap)}
.cards-2{display:grid;grid-template-columns:1fr 1fr;gap:var(--gap)}

/* a card that is itself a link — used for the two deliverables */
.card--link{display:flex;flex-direction:column;text-decoration:none}
/* flex children stretch by default, which would blow the badge to full width */
.card--link .card__idx{align-self:flex-start}
.card--link .card__go{
  margin-top:auto;padding-top:18px;
  font-family:var(--f-mono);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;
  color:var(--cage);transition:transform .2s;
}
.card--link:hover .card__go{transform:translateX(3px)}
.card__meta{
  list-style:none;margin:16px 0 0;padding:16px 0 0;border-top:1px solid var(--line);
  display:flex;flex-direction:column;gap:9px;font-size:.875rem;color:var(--muted);
}
.card__meta li{display:grid;grid-template-columns:14px 1fr;gap:10px;align-items:baseline}
.card__meta li::before{content:"";width:6px;height:6px;border:1px solid var(--cage);transform:rotate(45deg)}
.card{
  border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px 28px;
  background:var(--bg);
  position:relative;transition:border-color .3s,transform .3s,box-shadow .3s;
}
.card:hover{border-color:var(--limit-line);transform:translateY(-3px);box-shadow:var(--shadow-sm)}
.card__idx{
  display:inline-block;margin-bottom:16px;color:#fff;background:var(--cage);
  border:1px solid var(--cage);width:24px;height:24px;line-height:22px;text-align:center;
  border-radius:2px;letter-spacing:0;font-size:.7rem;
}
/* two-character codes (Π1, Π2) do not fit the square badge */
.card__idx--wide{width:auto;min-width:24px;padding-inline:7px}
.card p{color:var(--muted);font-size:.955rem;margin:0}
.card em{color:var(--text);font-style:normal;font-weight:600}

/* ---------- the 3-step loop ---------- */
.loopdiag{
  display:grid;grid-template-columns:1fr auto 1fr auto 1fr;align-items:start;gap:clamp(14px,2vw,30px);
  margin-top:clamp(34px,4vw,56px);padding:clamp(26px,3vw,40px) 0;
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.loopdiag__step .mono-label{color:var(--cage);display:block;margin-bottom:10px}
.loopdiag__step h3{font-family:var(--f-display);font-weight:660;font-size:1.02rem;margin:0 0 8px;letter-spacing:-.01em;color:var(--limit)}
.loopdiag__step p{color:var(--muted);font-size:.9rem;margin:0}
.loopdiag__arrow{align-self:center;width:100%;min-width:26px;height:1px;background:linear-gradient(90deg,var(--line-2),var(--limit));position:relative}
.loopdiag__arrow::after{content:"";position:absolute;right:0;top:-3px;border:3.5px solid transparent;border-left-color:var(--limit)}

/* ---------- stats ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;margin:clamp(30px,3.6vw,50px) 0 0;background:var(--line);border:1px solid var(--line)}
.stat{background:var(--bg);padding:24px 20px}
.stat dt{font-family:var(--f-mono);font-size:.6rem;letter-spacing:.16em;text-transform:uppercase;color:var(--dim);margin-bottom:10px}
.stat dd{margin:0;font-family:var(--f-display);font-weight:740;font-size:clamp(1.9rem,3.6vw,2.7rem);letter-spacing:-.035em;line-height:1;color:var(--limit)}

/* ---------- rules ---------- */
.rules{display:grid;gap:1px;background:var(--line);border:1px solid var(--line)}
.rule{display:grid;grid-template-columns:230px 1fr;gap:clamp(20px,3vw,44px);align-items:center;background:var(--bg);padding:clamp(24px,3vw,38px) clamp(20px,3vw,38px)}
.rule__diagram{background:var(--bg-alt);border:1px solid var(--line);border-radius:var(--radius);padding:10px}
.rule__tag{display:block;color:var(--cage);margin-bottom:7px;text-transform:lowercase;letter-spacing:.13em}
.rule__body p{color:var(--muted);font-size:.965rem;max-width:62ch}
.rule__body em{color:var(--text);font-style:italic}
.rule__body strong{color:var(--text);font-weight:600}
.formula{
  font-family:var(--f-mono);font-size:clamp(.9rem,1.25vw,1.06rem);color:var(--limit);
  background:var(--limit-soft);border-left:2px solid var(--cage);
  padding:11px 15px;margin:0 0 15px !important;display:inline-block;letter-spacing:.01em;
}

/* diagrams */
.dia{width:100%;height:auto}
.dia__cage{fill:none;stroke:var(--cage);stroke-width:1.5;stroke-linejoin:round}
.dia__cage-line{stroke:var(--cage);stroke-width:1.5}
.dia__ghost line,.dia__ghost rect,.dia__ghost path{fill:none;stroke:var(--line-2);stroke-width:1;stroke-dasharray:3 3.5}
.dia__pt--cage rect{fill:var(--bg);stroke:var(--cage);stroke-width:1.4}
.dia__pt--new{fill:var(--limit)}
.dia__pt--limit{fill:var(--limit)}
.dia__pt--new-g circle{fill:var(--limit)}
.dia__link{stroke:var(--limit);stroke-width:1;stroke-dasharray:2 3}
.dia__new path{fill:var(--limit-soft);stroke:var(--limit);stroke-width:1.2;stroke-linejoin:round}
.dia__label{font-family:var(--f-mono);font-size:10px;fill:var(--muted)}
.dia__label--limit{fill:var(--limit);font-weight:600}

/* ---------- split notes ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:var(--gap);margin-top:var(--gap)}
.note{border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;background:var(--bg)}
.note p{color:var(--muted);font-size:.955rem}
.note strong{color:var(--text);font-weight:600}
.note em{color:var(--limit);font-style:italic}
.note--accent{border-left:2px solid var(--cage)}

/* ---------- schemes ---------- */
.dias-4{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gap);margin-bottom:clamp(30px,3.4vw,48px)}
.diacard{margin:0;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg);padding:14px;transition:border-color .3s,box-shadow .3s}
.diacard:hover{border-color:var(--cage-line);box-shadow:var(--shadow-sm)}
.diacard figcaption{display:flex;flex-direction:column;gap:5px;margin-top:10px;padding-top:11px;border-top:1px solid var(--line)}
.diacard b{font-family:var(--f-display);font-weight:640;font-size:.92rem;letter-spacing:-.01em;color:var(--limit)}
.diacard .mono-label{font-size:.575rem;letter-spacing:.11em}

.tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg)}
.tbl{width:100%;border-collapse:collapse;min-width:860px;font-size:.9rem}
.tbl th,.tbl td{text-align:left;padding:15px 16px;border-bottom:1px solid var(--line);vertical-align:top}
.tbl thead th{
  font-family:var(--f-mono);font-size:.6rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--on-deep-mute);font-weight:500;background:var(--limit);white-space:nowrap;
}
.tbl tbody th{font-family:var(--f-display);font-weight:660;font-size:.96rem;white-space:nowrap;color:var(--limit)}
.tbl tbody th i{display:block;font-family:var(--f-mono);font-style:normal;font-weight:400;font-size:.63rem;letter-spacing:.06em;color:var(--dim);margin-top:5px;white-space:normal}
.tbl td{color:var(--muted)}
.tbl td:nth-child(2){white-space:nowrap;font-family:var(--f-mono);font-size:.82rem}
.tbl tbody tr:last-child th,.tbl tbody tr:last-child td{border-bottom:0}
.tbl tbody tr:hover{background:rgba(18,56,110,.035)}
.tbl__row--hero{background:linear-gradient(90deg,var(--cage-soft),transparent 55%);box-shadow:inset 3px 0 0 var(--cage)}
.tbl__row--hero:hover{background:linear-gradient(90deg,var(--cage-soft),transparent 55%)}
.tbl__sub{display:block;font-family:var(--f-mono);font-size:.6rem;color:var(--dim);margin-top:3px}
.pill{
  display:inline-block;font-family:var(--f-mono);font-size:.6rem;letter-spacing:.1em;text-transform:uppercase;
  padding:4px 9px;border-radius:2px;white-space:nowrap;
}
.pill--approx{background:var(--limit-soft);color:var(--limit);border:1px solid var(--limit-line)}
.pill--interp{background:var(--cage-soft);color:var(--cage);border:1px solid var(--cage-line)}

/* ============================================================
   REFERENCE PAGE — sticky in-page index beside the body, the
   shape of an API documentation index. Additive only: it reuses
   the existing tokens and table styles.
   ============================================================ */
.doclayout{display:grid;grid-template-columns:214px 1fr;gap:clamp(28px,4vw,64px);align-items:start}

.docnav{position:sticky;top:88px}
.docnav__title{display:block;margin:0 0 12px;padding-left:13px}
.docnav ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column}
.docnav a{
  display:block;padding:8px 13px;font-size:.86rem;line-height:1.4;
  color:var(--muted);text-decoration:none;border-left:2px solid var(--line);
  transition:color .2s,border-color .2s,background .2s;
}
.docnav a:hover{color:var(--limit);border-left-color:var(--cage);background:var(--bg-alt)}
/* η σελίδα στην οποία βρίσκεσαι — μαρκάρεται στο HTML, όχι με JavaScript */
.docnav a.is-here{background:var(--limit);border-left-color:var(--limit);color:#fff;font-weight:600}

.docsec{margin-bottom:clamp(40px,5.2vw,68px)}
.docsec:last-child{margin-bottom:0}
.docsec>h2{
  font-family:var(--f-display);font-weight:720;font-size:clamp(1.3rem,2vw,1.66rem);
  letter-spacing:-.022em;color:var(--limit);margin:0 0 16px;
  padding-bottom:13px;border-bottom:1px solid var(--line);
}
.docsec__intro{color:var(--muted);font-size:.96rem;max-width:70ch;margin:0 0 26px}

/* function table: the name in mono on the left, prose on the right */
.tbl--fn{min-width:440px}
.tbl--fn th[scope="row"]{
  font-family:var(--f-mono);font-size:.85rem;font-weight:500;color:var(--cage);
  white-space:nowrap;width:1%;
}
.tbl--fn td,.tbl--fn td:nth-child(2){
  white-space:normal;font-family:var(--f-body);font-size:.92rem;
}

/* topics index */
.topics{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line)}
.topics a{background:var(--bg);display:flex;flex-direction:column;gap:6px;padding:19px 21px;text-decoration:none;transition:background .25s}
.topics a:hover{background:var(--panel-2)}
.topics b{font-family:var(--f-display);font-weight:660;font-size:.99rem;letter-spacing:-.012em;color:var(--limit)}
.topics span{color:var(--muted);font-size:.88rem;line-height:1.55}

/* ---------- creases ---------- */
.creasegrid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,3.4vw,52px);align-items:start}
.crease{
  margin:0;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--panel);overflow:hidden;box-shadow:var(--shadow-sm);
}
.crease__head{display:flex;justify-content:space-between;gap:12px;padding:13px 16px;border-bottom:1px solid var(--line);flex-wrap:wrap;background:var(--bg-alt)}
.crease__head .mono-label{color:var(--limit)}
.crease__val{color:var(--cage) !important;letter-spacing:.09em}
.crease__val b{font-weight:600}
.crease__stage{padding:8px}
#creaseCanvas{width:100%;height:auto;aspect-ratio:1/.62;display:block}
.slider{display:block;padding:6px 16px 0}
.slider input{
  -webkit-appearance:none;appearance:none;width:100%;height:22px;background:transparent;cursor:pointer;
}
.slider input::-webkit-slider-runnable-track{height:2px;background:linear-gradient(90deg,var(--limit),var(--cage));border-radius:2px}
.slider input::-moz-range-track{height:2px;background:linear-gradient(90deg,var(--limit),var(--cage));border-radius:2px}
.slider input::-webkit-slider-thumb{-webkit-appearance:none;width:13px;height:13px;background:var(--cage);border-radius:50%;margin-top:-5.5px;border:0}
.slider input::-moz-range-thumb{width:13px;height:13px;background:var(--cage);border-radius:50%;border:0}
.crease__scale{display:flex;justify-content:space-between;padding:2px 16px 15px;font-size:.575rem;letter-spacing:.1em}

.crease__copy{display:flex;flex-direction:column;gap:var(--gap)}
.featlist{list-style:none;margin:0;padding:0;display:grid;gap:1px;background:var(--line);border:1px solid var(--line)}
.featlist li{background:var(--bg);padding:15px 18px;display:grid;grid-template-columns:118px 1fr;gap:16px;align-items:baseline;font-size:.9rem;color:var(--muted)}
.featlist b{font-family:var(--f-mono);font-size:.63rem;letter-spacing:.14em;text-transform:uppercase;color:var(--cage);font-weight:500}

/* ---------- versus ---------- */
.versus{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line)}
.vs{background:var(--bg);padding:clamp(26px,3vw,40px)}
.vs .h3{font-size:1.16rem;margin-bottom:20px;padding-bottom:14px;border-bottom:1px solid var(--line);color:var(--limit)}
.vslist{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:16px}
.vslist li{position:relative;padding-left:22px;color:var(--muted);font-size:.945rem}
.vslist li::before{
  content:"";position:absolute;left:0;top:.62em;width:7px;height:7px;
  border:1px solid var(--cage);transform:rotate(45deg);
}
.vslist strong{color:var(--text);font-weight:600}
.vslist em{color:var(--limit);font-style:italic}

/* ---------- uses ---------- */
.uses{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.use{background:var(--bg);padding:28px 24px 30px;transition:background .3s}
.use:hover{background:var(--panel-2)}
.use .h3{color:var(--limit);padding-bottom:12px;margin-bottom:12px;border-bottom:1px solid var(--line)}
.use p{color:var(--muted);font-size:.9rem;margin:0}
.use em{color:var(--text);font-style:italic}

/* ---------- stack ---------- */
.stackgrid{display:grid;grid-template-columns:1.35fr 1fr 1fr;gap:var(--gap);align-items:start}
.stackcard{border:1px solid var(--line);border-radius:var(--radius);padding:28px 26px 30px;background:var(--bg)}
.stackcard--lead{border-top:2px solid var(--cage)}
.stackcard__kicker{display:block;margin-bottom:10px;color:var(--cage)}
.stackcard .h3{font-size:1.35rem;font-weight:720;letter-spacing:-.022em;margin-bottom:14px;color:var(--limit)}
.stackcard>p{color:var(--muted);font-size:.93rem}
.stackcard em{color:var(--text);font-style:italic}
.stackcard strong{color:var(--text);font-weight:600}

.layers{list-style:none;margin:20px 0;padding:0;display:grid;gap:1px;background:var(--line);border:1px solid var(--line)}
.layers li{background:var(--bg-alt);padding:11px 14px;display:grid;grid-template-columns:48px 1fr;gap:12px;align-items:baseline;font-size:.85rem;color:var(--muted)}
.layers b{font-family:var(--f-mono);font-size:.78rem;color:var(--cage);font-weight:600}
.perfnote{
  border-left:2px solid var(--limit);background:var(--limit-soft);
  padding:15px 17px;font-size:.895rem;color:var(--muted);margin:0 !important;
}
.perfnote em{color:var(--cage);font-style:normal;font-weight:600}

.code{
  margin:18px 0 12px;padding:16px;overflow-x:auto;
  background:var(--bg-alt);border:1px solid var(--line);border-radius:var(--radius);
  font-family:var(--f-mono);font-size:.735rem;line-height:1.8;color:#3A4A63;
}
.code .c-k{color:var(--cage)}
.code .c-t{color:var(--text);font-weight:600}
.code .c-s{color:var(--limit)}
.code .c-n{color:#8A5A00}
.mini{font-size:.82rem;color:var(--dim);margin:0}

.tools{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:15px}
.tools li{display:flex;flex-direction:column;gap:5px;font-size:.875rem;color:var(--muted);padding-bottom:15px;border-bottom:1px solid var(--line)}
.tools li:last-child{border-bottom:0;padding-bottom:0}
.tools b{font-family:var(--f-display);font-weight:660;font-size:.94rem;color:var(--limit);letter-spacing:-.01em}

/* ---------- timeline ---------- */
.tl{list-style:none;margin:0;padding:0;position:relative}
.tl::before{content:"";position:absolute;left:0;top:6px;bottom:6px;width:1px;background:linear-gradient(180deg,var(--cage),var(--limit))}
.tl__item{display:grid;grid-template-columns:132px 1fr;gap:clamp(18px,3vw,44px);padding:22px 0 22px 26px;border-bottom:1px solid var(--line);position:relative}
.tl__item::before{
  content:"";position:absolute;left:-4px;top:32px;width:9px;height:9px;
  background:var(--bg-alt);border:1px solid var(--cage);transform:rotate(45deg);
}
.tl__item--key::before{background:var(--cage);border-color:var(--cage)}
.tl__item:last-child{border-bottom:0}
.tl__yr{font-family:var(--f-mono);font-size:.9rem;letter-spacing:.06em;color:var(--muted);padding-top:2px}
.tl__item--key .tl__yr{color:var(--cage);font-weight:600}
.tl__item h2{font-family:var(--f-display);font-weight:660;font-size:1.06rem;margin:0 0 7px;letter-spacing:-.012em;color:var(--limit)}
.tl__item p{color:var(--muted);font-size:.93rem;margin:0;max-width:76ch}
.tl__item em{color:var(--text);font-style:italic}

/* ---------- faq ---------- */
.faq{border-top:1px solid var(--line)}
.qa{border-bottom:1px solid var(--line)}
.qa summary{
  cursor:pointer;list-style:none;padding:22px 40px 22px 0;position:relative;
  font-family:var(--f-display);font-weight:600;font-size:1.05rem;letter-spacing:-.012em;
  color:var(--limit);transition:color .2s;
}
.qa summary::-webkit-details-marker{display:none}
.qa summary:hover{color:var(--cage)}
.qa summary::after{
  content:"";position:absolute;right:6px;top:50%;width:10px;height:10px;
  border-right:1.5px solid var(--cage);border-bottom:1.5px solid var(--cage);
  transform:translateY(-70%) rotate(45deg);transition:transform .28s;
}
.qa[open] summary::after{transform:translateY(-20%) rotate(-135deg)}
.qa p{color:var(--muted);font-size:.965rem;padding:0 8% 26px 0;margin:0}

/* ---------- sources ---------- */
.srcgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(24px,3vw,48px)}
.srcgroup h2{margin:0 0 16px;padding-bottom:11px;border-bottom:1px solid var(--line);color:var(--cage)}
.srclist{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:14px}
.srclist a{
  color:var(--muted);text-decoration:none;font-size:.885rem;line-height:1.55;
  display:block;padding-left:16px;position:relative;transition:color .2s;
}
.srclist a::before{content:"↗";position:absolute;left:0;top:0;color:var(--cage);font-size:.8em;transition:color .2s,transform .2s}
.srclist a:hover{color:var(--limit)}
.srclist a:hover::before{transform:translate(1px,-1px)}
.srclist i{color:var(--limit);font-style:italic}

/* ---------- cta ---------- */
.cta{
  padding-block:clamp(62px,7.5vw,110px);
  background:var(--deep);
  color:var(--on-deep);
  border-top:1px solid var(--deep);
}
.cta__inner{display:flex;justify-content:space-between;align-items:center;gap:clamp(24px,4vw,60px);flex-wrap:wrap}
.cta__title{margin-bottom:12px;color:#fff}
.cta__sub{color:var(--on-deep-mute);max-width:52ch;margin:0;font-size:1rem}
.cta .btn--solid{background:#fff;color:var(--deep)}
.cta .btn--solid:hover{background:var(--cage);color:#fff}

/* ---------- footer ---------- */
.foot{border-top:1px solid rgba(255,255,255,.14);padding-block:44px;background:var(--deep);color:var(--on-deep-mute)}
.foot__inner{display:grid;grid-template-columns:auto 1fr auto;gap:clamp(20px,3vw,50px);align-items:start}
.foot__brand{font-family:var(--f-display);font-weight:720;font-size:.95rem;letter-spacing:-.02em;margin:0;color:#fff}
.foot__note{color:var(--on-deep-mute);font-size:.85rem;margin:0;max-width:62ch}
.foot__note a{color:#fff;text-decoration:underline;text-underline-offset:3px}
.foot__note a:hover{color:var(--cage)}
.foot__meta{margin:0;text-align:right;line-height:1.9;color:var(--on-deep-mute)}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width:1180px){
  .uses{grid-template-columns:repeat(2,1fr)}
  .dias-4{grid-template-columns:repeat(2,1fr)}
  .stackgrid{grid-template-columns:1fr 1fr}
  .stackcard--lead{grid-column:1/-1}
}

@media (max-width:1000px){
  .doclayout{grid-template-columns:1fr;gap:30px}
  .docnav{position:static;background:var(--bg-alt);border:1px solid var(--line);border-radius:var(--radius);padding:16px 14px}
  .docnav .is-group a{margin-top:10px}

  .hero__grid{grid-template-columns:1fr;gap:38px}
  .refiner{order:2}
  .cards-3{grid-template-columns:1fr}
  .srcgrid{grid-template-columns:1fr;gap:32px}
  .foot__inner{grid-template-columns:1fr;gap:22px}
  .foot__meta{text-align:left}
}

@media (max-width:1060px){
  .nav__links{
    position:absolute;top:66px;left:0;right:0;
    flex-direction:column;gap:0;
    /* the desktop rule centres its items — reset it, or the burger list
       comes out centred instead of left-aligned */
    align-items:stretch;align-self:auto;
    /* fully opaque: this panel sits on top of the page content, so a
       translucent background is a readability problem, not an effect */
    background:var(--bg);
    border-bottom:1px solid var(--line);
    box-shadow:0 18px 40px -34px rgba(11,17,28,.8);
    padding:8px clamp(20px,4.6vw,60px) 20px;
    display:none;
  }
  .nav__links.is-open{display:flex}
  .nav__links a{padding:13px 0;border-bottom:1px solid var(--line);font-size:.78rem}
  .nav__links a::after{display:none}
  .nav__links a.is-active{padding-left:10px;border-left:2px solid var(--cage)}

  /* inside the burger menu there is nothing to drop down onto — the
     sub-pages become a plain indented list, always visible */
  .nav__group{flex-direction:column;align-items:stretch;align-self:auto;gap:0}
  .nav__caret{display:none}
  .nav__sub{
    position:static;opacity:1;visibility:visible;transform:none;
    min-width:0;padding:0 0 0 14px;margin:0;
    background:transparent;border:0;border-left:2px solid var(--line);
    border-radius:0;box-shadow:none;
  }
  .nav__sub a{padding:11px 0 11px 12px;font-size:.78rem;border-bottom:1px solid var(--line)}
  .nav__sub li:last-child a{border-bottom:0}
  .nav__sub a.is-active{background:transparent;color:var(--cage);border-left:0;padding-left:12px}

  .burger{display:flex}
  .nav__tools{margin-left:auto}
}

@media (max-width:880px){
  .cards-2{grid-template-columns:1fr}
  .topics{grid-template-columns:1fr}
  .creasegrid{grid-template-columns:1fr}
  .versus{grid-template-columns:1fr}
  .split{grid-template-columns:1fr}
  .stackgrid{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .rule{grid-template-columns:1fr;gap:22px}
  .rule__diagram{max-width:230px}
  .loopdiag{grid-template-columns:1fr;gap:26px}
  .loopdiag__arrow{display:none}
  .tl__item{grid-template-columns:1fr;gap:8px}
  .cta__inner{flex-direction:column;align-items:flex-start}
}

@media (max-width:560px){
  .uses{grid-template-columns:1fr}
  .dias-4{grid-template-columns:1fr 1fr}
  .featlist li{grid-template-columns:1fr;gap:6px}
  .refiner__ui{flex-direction:column;align-items:flex-start;gap:14px}
  .readout{width:100%;justify-content:space-between}
  .h-display{font-size:clamp(2.15rem,10vw,3rem)}
  .qa p{padding-right:0}
  .pager{grid-template-columns:1fr}
  .pager__side--next{grid-column:1;text-align:left;align-items:flex-start}
}